Exercise device



FIG. 1 is a perspective view of an exercise showing the design;

FIG. 2 is a front elevation view of the exercise device;

FIG. 3 is a top elevation view of the exercise device, and the opposite bottom view is a mirror image thereof;

FIG. 4 is a rear elevation view of the exercise device; and,

FIG. 5 is a side elevation view of the exercise device, and the opposite side view is a mirror image thereof.

The broken lines shown in the figures represent portions of the exercise device that form no part of the claimed design. 

CLAIM The ornamental design for an exercise device, as shown and described. 